Question

THE AGES OF A AND B ARE IN THE RATIO 5:7.FOUR YEARS HENCE THE RATIO OF THEIR AGES WILL BE 3:4. THE PRESENT AGE OF B IN YEARS​

Answer 1

let a age be 5x and b age be 7x

now according to the question

5x+4/7x+4=3/4

=5x+4*4=7x+4*3

=20x+16=21x+12

=20x-21x=12-16

= -x=-4

here minus sign will be cancelled

thus b age is 28 years

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